Swing Blade Broadhead Dynamics for Drag and Wound Optimization
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Solution Overview
Problem
Existing archery technologies lack a swing blade broadhead design that minimizes aerodynamic drag during flight while allowing the outer perimeter of pivoting blades to increase upon penetration, optimizing both aerodynamics and wound creation in game animals.
Innovation Solution
A swing blade broadhead design featuring a shank base, multiple pivoting blades, a bullet nose, an o-ring, and fasteners, where the blades have a minimized outer perimeter during flight due to the o-ring's inward bias, and expand upon penetration to create a large wound, with features like location pins, pintle rolls, and retention radii facilitating quick blade replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the outer perimeter of the broadhead is increased to create a larger wound, then the wound size increases, but the aerodynamic drag during flight increases
Solution Approach 1:
The broadhead employs swing blades that are stationary during flight but pivot to an open position upon impact with the game animal. This dynamic transformation allows the broadhead to maintain a compact aerodynamic profile during flight while expanding to a larger wound-causing configuration upon impact, resolving the contradiction between aerodynamic efficiency and wound size.
Solution Approach 2:
The broadhead is divided into multiple independent swing blades that can move relative to each other. Each blade is hinged at the base, allowing them to pivot independently from a closed flight position to an open wound-position. This segmentation enables the transition from a compact aerodynamic shape to an expanded wound-causing shape.
2Ease of manufacture
If fixed blades are used to maintain structural simplicity, then manufacturing is easier, but blade replacement becomes time-consuming
Solution Approach 1:
The broadhead is divided into modular components: the base and the individual swing blades. Each blade can be independently removed and replaced by detaching it from the base, allowing for quick replacement of damaged blades without replacing the entire broadhead. This modular segmentation maintains structural simplicity while enabling rapid blade replacement.
Solution Approach 2:
The design allows damaged swing blades to be discarded and replaced with new or备用 blades while retaining the intact base and functional blades. This selective replacement approach reduces time loss compared to replacing the entire broadhead, while maintaining the simple modular structure.
3Object-affected harmful factors
If the outer perimeter is minimized during flight to reduce drag, then aerodynamic efficiency improves, but the wound creation capability is reduced
Solution Approach 1:
The swing blades transition from a closed, aerodynamic configuration during flight to an open, wound-creating configuration upon impact. This dynamic size change allows the broadhead to optimize aerodynamic efficiency during flight while maximizing wound creation capability at the moment of impact, resolving the contradiction between minimized drag and maximized wound area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances aerodynamic efficiency during flight and creates a larger wound in game animals by minimizing drag and maximizing blade expansion upon penetration, addressing the need for both optimized flight and penetration performance.
Implementation Method 1
the o-ring forces the plurality of swing blades inward toward the blade base to create a minimized outer perimeter
Implementation Method 2
As the plurality of swing blades enter the flesh of a game animal, the blades open-up relative to the blade base and create a large wound in the flesh of a game animal
Data Source
AI summary
A swing blade broadhead preferably includes a shank base, a plurality of swing blades, a bullet nose and a plurality of fasteners. The shank base includes an arrow shaft shank, a blade shoulder and a blade base. The blade base preferably includes a plurality of outer flat surfaces and a circular sector formed between two adjacent outer flat surfaces. Each swing blade includes a blade portion and a pintle roll. The blade portion preferably includes a base portion and a tail portion. The pintle roll is formed on one end of the base portion to receive a fastener. The circular sectors are sized to receive an outer perimeter of the pintle roll. A plurality of tapped holes are formed in blade shoulder to threadable receive the plurality of fasteners. The bullet nose includes a plurality of counter bored holes to receive the plurality of fasteners.